Cleaning mat with a plurality of disposable sheets

ABSTRACT

A cleaning mat system is designed for placement on a floor and for cleaning the undersides of shoes, feet, and other objects. The cleaning mat system includes a base with an upper surface and a lower surface interconnected by a perimeter edge. The perimeter edge includes a leading edge and an opposed trailing edge. The upper surface of the base includes upwardly extending teeth covering the majority of the upper surface, and the lower surface includes downwardly extending teeth on at least a portion of the lower surface adjacent the leading and trailing edges. A removable and disposable cleaning sheet has an upper face for cleaning and an opposed lower face. The cleaning sheet has a pair of spaced-apart side edge portions and a central portion. In use, the cleaning sheet is positioned on the base such that the central portion is adjacent the upper surface of the base and the side edge portions wrap around the leading and trailing edges to be trapped between the teeth and the floor.

REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent applicationSer. No. 10/261,150, filed Sep. 30, 2002;

which is a continuation-in-part of U.S. patent application Ser. No.09/599,307, filed Jun. 22, 2000 U.S. Pat. No. 6,458,442; and

a continuation-in-part of U.S. patent application Ser. No. 09/993,137,filed Nov. 16, 2001 U.S. Pat. No. 6,810,554;

which is a continuation-in-part of U.S. patent application Ser. No.09/979,415, filed Jun. 11, 1999 abandoned;

which is a national stage of PCT/US99/12945, filed Jun. 11, 1999;

and is a continuation-in-part of U.S. patent application Ser. No.09/602,189, filed Jun. 12, 2000, now U.S. Pat. No. 6,405,403;

which is a continuation-in-part of U.S. patent application Ser. No.09/094,551, filed Jun. 12, 1998, now U.S. Pat. No. 6,298,517; and

claims benefit of U.S. provisional patent application Ser. No.60/260,969, filed Jan. 10, 2001; and

claims benefit of U.S. provisional patent application Ser. No.60/311,463, filed Aug. 11, 2001; and

claims priority to U.S. provisional patent application Ser. No.60/356,031, filed Feb. 11, 2002, and No. 60/333,101, filed Nov. 6, 2001,

the entire contents of each application being incorporated herein byreference.

FIELD OF THE INVENTION

The present invention relates generally to rugs and cleaning mats and,more specifically, to a cleaning mat with a plurality of removable anddisposable cleaning sheets.

BACKGROUND OF THE INVENTION

As people, pets, and objects move from place to place, their feet orwheels often pick up dirt and debris, which is carried along as theymove. The dirt and debris is thereby spread to other places, such as theinteriors of houses, offices, and hospitals. Obviously, it is desirableto prevent the spread of dirt and debris, and many attempts have beenmade to do so. Chief among these are rugs and mats that are placed inthe entryways of homes, offices, and hospitals. It is hoped that theserugs or mats will remove and retain some of the dirt and debris from theshoes and wheels of people, pets, and objects. However, this is oftennot the case. In many situations, these rugs and mats are not frequentlyor sufficiently cleaned and are themselves a source of dirt and debris.Also, even a clean rug or mat often does a poor job of removing dirt anddebris from feet and wheels. These mats and rugs also preferably removeliquid from feet and wheels. However, they often do an insufficient jobof this as well. They may have limited absorption and may also becomequickly wetted where they no longer can absorb additional liquid.

The problem of dirt and debris on the shoes of people is especiallyworrisome in hospital operating rooms and manufacturing clean roomfacilities. For these purposes, “tacky mats” have been developed. Thesemats typically consist of a plurality of layers of thin plastic withadhesive coated on the upper surface of each layer. In theory, a personwalks across the mat and the adhesive grabs the dirt and debris from theunderside of their shoes. Once the mat is sufficiently covered with dirtand debris, the soiled layer is peeled from the remaining layers toexpose a fresh layer with fresh adhesive. Examples of these types ofmats are disclosed and explained in U.S. Pat. Nos. 4,107,811 to Imsandeand 4,559,250 to Paige. While this type of mat may have limitedapplicability, it suffers from numerous shortcomings. The plastic layerseasily tear when removed and also require users to carefully walk acrossthem to avoid tearing in use. The adhesive on the layers only removesdirt and debris that is lightly attached to the underside of the shoes.If the shoes are more heavily soiled, it is impossible for the user towipe their feet, since doing so would likely tear the plastic sheet.Probably the most serious drawback of this type of mats is that they areabsolutely incapable of absorbing liquids from the bottom of shoes.Therefore, they are only suited for applications where it is known thatthe shoes are already dry. Hence, the mats cannot be used in entrywaysto buildings where shoes may be heavily soiled and/or wet.

A slight improvement is provided by a tacky mat disclosed and explainedin U.S. Pat. No. 3,665,543 to Nappi. In this version, a gauze sheet isembedded in the adhesive layer and fully saturated with adhesive. Thegauze sheet serves the dual purposes of strengthening the plasticunderlayer and providing a rougher upper surface to improve retention ofdirt and debris. However, this mat still fails to address the need toabsorb liquids. It also is only suitable for very light wiping since thegauze layer is insubstantial.

A different approach to the mat or rug problem is taken by U.S. Pat.Nos. 5,506,040 and 5,834,104 to Cordani and U.S. Pat. No. 5,173,346 toMiddleton. In each of these patents, an absorbent layer overlies amoisture barrier layer. The absorbent layer absorbs liquid and themoisture barrier layer prevents the liquid from transferring out of themat. In the case of the Middleton patent, the absorbent mat is designedto catch and absorb fluids which drip from an operating table duringsurgery. Therefore, the absorbent layer is highly absorbent andretentive of fluid, but is not designed to be walked across as with anormal rug or mat used in an entryway. The Cordani patents disclose matswhich are designed for use in entryways. Therefore, the absorbent layeris designed to be walked across and absorbs liquid and tolerates atleast some wiping of shoes. However, the Cordani mats lack the tackinessof the previously discussed “tacky mats” and therefore have limitedcapability to grab dirt and debris from the shoes of people walking overthe mat. Also, the Cordani mats are only a single layer and thereforelack the functionality of the plurality of sheets used in a typicaltacky mat. A significant advantage to the stacked tacky mats is thatusers may very easily “clean” the mat by simply peeling off anddisposing of the uppermost layer. With the Cordani mats, the entire matmust be replaced. This discourages “cleaning.”

In light of the above, there remains a need for a cleaning mat or rugwhich encourages users to “clean” the mat whenever the mat becomessoiled, is capable of tolerating wiping, absorbs liquids, and has thecapability to grab and retain dirt and debris.

SUMMARY OF THE INVENTION

The present invention overcomes many of the shortcomings of the priorart. A cleaning mat according to the present invention is designed to beplaced on a floor and to clean the undersides of shoes, feet, and otherobjects. The cleaning pad includes a base sheet which is designed torest on the floor. The base sheet has an upper surface and lower surfacewith the lower surface designed to contact the floor. Multiple removableand disposable cleaning sheets are supported in a stacked configurationon the upper surface of the base sheet. Each of the cleaning sheetsincludes an upper bibulous layer having an upper face. The bibulouslayer is designed to absorb liquid from an object which contacts theupper face. Each cleaning sheet also includes a lower moisture barrierlayer which has an upper face adjacent the bibulous layer. The barrierlayer is operative to prevent transport of liquid from the bibulouslayer to other cleaning sheets below the barrier layer. In someembodiments, an adhesive covers a portion of the upper face of the upperbibulous layer and is designed to grab and retain dirt and debris thatcomes into contact with the upper face. A portion of the upper faceremains non-occluded such that absorbency is maintained. In otherembodiments, a plurality of perforations are provided through the upperbibulous layer to retain debris. In yet other embodiments, the moisturebarrier layer extends beyond the edges of the bibulous layer to define aperimeter surrounding the bibulous layer. The perimeter of each of thecleaning sheets may be bonded together with adhesive so as to seal inunexposed bibulous layers.

An alternative embodiment of the present invention provides a cleaningmat system with a base designed to rest on the floor. The base has anupper surface and a lower surface interconnected by a perimeter edge,with the perimeter edge including a leading edge and an opposed trailingedge. The base also includes multiple gripping members defined on thelower surface. At least one of the gripping members is adjacent each ofthe leading and trailing edges. The lower surface of the base isdesigned to be supported on the floor. The cleaning mat system alsoincludes a removable and disposable cleaning sheet with an upper facefor cleaning and an opposed lower face. The cleaning sheet has a pair ofspaced apart side edges. The cleaning sheet includes an upper fabriclayer with an upper face that defines the upper face of the cleaningsheet. The upper layer of the cleaning sheet is operative to clean anobject which contacts the upper face. The cleaning sheet also has alower reinforcement layer with an upper face which is adjacent the upperlayer and an opposed lower face which defines the lower face of thecleaning sheet. The lower reinforcement layer supports and reinforcesthe upper layer. The cleaning sheet is disposed on the base such thatthe lower face is adjacent the upper surface of the base. One of theside edges of the cleaning sheet engages one of the gripping members onthe lower surface of the base and the other side edge engages another ofthe gripping members on the lower surface of the base such that thecleaning sheet is retained on the base with the upper face directedupwardly to clean an object that contacts the cleaning mat system. Infurther embodiments, the reinforcement layer is dispensed with, with thecleaning sheet consisting of a fabric layer. In other embodiments,multiple cleaning sheets are provided in a stacked configuration, withthe uppermost cleaning sheet being removable after it is soiled. In yetfurther embodiments, the cleaning sheets are provided as cleaningsleeves with an opening that receives the base. The cleaning sheet isthen retained on the base by the base being received in the opening andthe cleaning sleeve wrapping about the base with a fabric surfacedirected upwardly.

Alternative embodiments provide a base with upwardly extending teeth onthe upper surface and a cleaning sheet or sleeve is partially penetratedby these teeth. The teeth cooperate with the sheet to help retain it inposition on the floor mat base.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first embodiment of a cleaning mataccording to the present invention;

FIG. 2 is a cross-sectional view of a portion of the cleaning mat ofFIG. 1 taken along lines 2—2;

FIG. 3 is a top plan view of a second embodiment of a cleaning mataccording to the present invention;

FIG. 4 is a cross-sectional view of a portion of the cleaning mat ofFIG. 3 taken along lines 4—4;

FIG. 5 is a perspective view of a third embodiment of a cleaning mataccording to the present invention;

FIG. 6 is a cross-sectional view of a portion of the cleaning mat ofFIG. 5 taken along lines 6—6;

FIG. 7 is a perspective view of a fourth embodiment of a cleaning mataccording to the present invention;

FIG. 8 is a cross-sectional view of a portion of the cleaning mat ofFIG. 7 taken along lines 8—8;

FIG. 9 is a top plan view showing a perforation or serration approachfor a cleaning mat according to the present invention to encouragefolding the mat;

FIG. 10 is a perspective view of a fifth embodiment of a cleaning mataccording to the present invention;

FIG. 11 is a perspective view of a sixth embodiment of a cleaning mataccording to the present invention;

FIG. 12 is a detail view of a tab for use with the various embodiment ofthe present invention.

FIG. 13 is a perspective view of a three piece base for use with a sixthembodiment of a cleaning mat system according to the present invention,with the pieces separated;

FIG. 14 is perspective view of the base of FIG. 13, with the threepieces assembled to form a single base;

FIG. 15 is an end view of the base of FIGS. 13 and 14, with a cleaningsheet disposed on the base;

FIG. 16 is a perspective view of a base with a cleaning sheet disposedthereon;

FIG. 17A is a plan view of one embodiment of a stack of cleaning sheets;

FIG. 17B is a end view of the stack of cleaning sheets in FIG. 17A;

FIG. 17C is an end view of an alternative embodiment of a stack ofcleaning sheets, with a base sheet;

FIG. 17D is a end view of another alternative embodiment of a stack ofcleaning sheets;

FIG. 18A is a bottom view of the base of FIGS. 13 and 14, without acleaning sheet installed;

FIG. 18B is a bottom view similar to FIG. 18A, with a cleaning sheetpartially installed;

FIG. 18C is a bottom view similar to FIGS. 18A and 18B, with a cleaningsheet completely installed;

FIG. 19 is an end view of an alternative embodiment of a base, includinga slot therethrough for passage of the cleaning sheet, with the cleaningsheet shown installed thereon;

FIG. 20 is a side elevational view of an alternative embodiment of thebase designed for folding;

FIG. 21 is a side view of the base of FIG. 20, with the base folded forstorage or shipping;

FIG. 22 is an end view of an alternative embodiment of a base andcleaning sheet, with the cleaning sheet taking the form of a cleaningsleeve wrapped about the base;

FIG. 23 is a perspective view of the base and cleaning sheet of FIG. 22;

FIG. 24 is bottom view of yet another alternative embodiment of a basefor use with the present invention;

FIG. 25 is a cross-sectional view taken along lines 25—25 in FIG. 24;

FIG. 26 is a bottom view of another design for the base;

FIG. 27 is a bottom view of yet another design for the bottom of thebase;

FIG. 28 is a perspective view of yet another embodiment of the base foruse with the present invention;

FIG. 29 is a plan view of the base of FIG. 28;

FIG. 30 is a cross-sectional side view of the base of FIGS. 28 and 29;

FIG. 31 is a detailed view of the teeth for use with the base of FIGS.28–30;

FIG. 32 is a cross-sectional end view of the base of FIGS. 28–30 with adisposable sleeve disposed thereon;

FIG. 33 is a cross-sectional end view of an alternative embodiment of abase within an alternative embodiment of a cleaning sheet disposedthereon.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 and 2, a first embodiment of a cleaning mataccording to the present invention is generally shown at 10. Thecleaning mat 10 is designed to be positioned on a floor such as in anentryway of a house or office. It is sized to be sufficiently large suchthat the person walking across the mat may easily step on an uppersurface of the mat and clean their feet. As will be clear to those ofskill in the art, the size and shape of the mat 10 may vary depending onthe application. The mat 10 preferably includes a base sheet 12 which isdesigned to lay on the floor 13. The base sheet 12 has a lower surfacewhich contacts the floor 13 and an upper surface which faces away fromthe floor 13. A plurality of removable and disposable cleaning sheets 14is supported in a stacked configuration on the upper surface of the basesheet 12.

As best shown in FIG. 2, each of the cleaning sheets includes an upperbibulous layer 16 and a lower moisture barrier layer 18. The bibulouslayer 16 and moisture barrier layer 18 are preferably bonded to oneanother such as by adhesive 20. The bibulous layer 16 is designed toabsorb liquid from a shoe or object which contacts its upper face 22.Therefore, when a person walks across the uppermost cleaning sheet andcontacts the upper face 22 of the uppermost bibulous layer 16, thebibulous layer 16 absorbs liquid from the person's shoes. Also, thebibulous layer is preferably tough enough to withstand wiping of shoeson its upper surface 22. As will be clear to those of skill in the art,the bibulous layer 16 may be constructed from any of a variety ofmaterials. For example, non-woven substrates such as spunlace, airlaid,wet laid, rayon, polyester, melt blown felt or any other non-wovenfabric may be used; woven fabrics may also be used for particularapplications. Spunlace is preferred because the non-woven has loft orfuzz. This requires less tacky adhesive on the back side of the moisturebarrier layer which holds the stack in place and provides for easyseparation of stacked sheets. It also does a better job collectingdebris. Because the bibulous layer 16 is designed to absorb liquid, someembodiments of the present invention include a super absorbent powderadditive in the bibulous layer. Examples of the super absorbent powderadditives may be found in children's diapers. They are typicallygel-like substances which absorb many times their weight in liquid andretain liquid.

Obviously, it is preferred that the moisture absorbed by the bibulouslayer 16 is retained by the bibulous layer. That way, once the uppermostsheet 14 becomes soiled, that sheet 14 may be peeled away to reveal afresh sheet. The moisture barrier layer 18 is operative to preventtransport of liquid out of the bibulous layer 16 into adjacent bibulouslayers. The moisture barrier layer 18 may be plastic such aspolypropylene or polyethylene. Other examples of materials for themoisture barrier layer include nylon, waterproof paper, Tyvek®, Suralynand Mylar.

As shown in FIG. 2, it is preferred that the moisture barrier layer 18be coextensive with the bibulous layer 16 and extend somewhat beyond theedges of the absorbent layer 16 so as to define a perimeter portion 24surrounding the bibulous layer 16. This perimeter portion 24 helps toprevent liquid from running out the sides of the bibulous layer 16 andcontaminating underlying bibulous layers. As an alternative to thisapproach, the perimeter portion 24 of the moisture barrier 18 may beturned up at its edges to better surround the bibulous layer 16. Ofcourse, the moisture barrier layer 18 may be trimmed to match the edgesof the bibulous layer 16 and eliminate the perimeter portion 24 if sodesired. Also, the moisture barrier layer 18 may be a layer of materialapplied directly to the underside of the bibulous layer 16. For example,a waterproof coating may be applied to the underside of the bibulouslayer. As a further alternative, the moisture barrier layer 18 andbibulous layer 16 may be melt bonded or extrusion bonded to one anotherrather than interconnected by adhesive 20. In the embodiment of FIGS. 1and 2, a light layer of adhesive is applied to the underside of themoisture barrier layer 18 in order to interconnect it with theimmediately adjacent bibulous layer 16. This adhesive acts to retain theplurality of cleaning sheets 14 in their stacked configuration. Toremove an upper soiled layer, a user merely grasps the perimeter portion24 of the soiled layer and pulls upwardly to remove it from theremaining cleaning sheets. As an alternative, the adhesive 26 on theunderside of the moisture barrier layer 18 may be left off in certainareas or around the entire perimeter to ease peeling of the soiledlayer. Also, pull tabs or other removal aids may be provided. An exampleof a pull tab for use with the present invention is shown in FIG. 12. Asa further alternative, a portion of the area wherein the layersinterconnect may be coated with a release agent or release layer to easepeeling.

Turning now to FIGS. 3 and 4, a second embodiment of a cleaning mataccording to the present invention is generally shown at 30. Thisembodiment differs from the first embodiment shown in FIGS. 1 and 2 intwo respects. First, the moisture barrier layers 32 are shown extendingfurther from the edges of the bibulous layers 34 so as to define alarger perimeter portion 36. Secondly, a pattern coated adhesive layer38 is shown applied to the upper surface of each of the bibulous layers34. The pattern coated adhesive layer 38 makes the upper surface of thebibulous layer 34 tacky so that dirt and debris is “grabbed” from thesoles of shoes and other objects that come in contact with the mat 30.By pattern coating, it is meant that the adhesive layer 38 covers only aportion of the upper face of the bibulous layer 34, so that theabsorbency of the bibulous layer 34 is retained.

In FIG. 3, the adhesive layer 38 is shown consisting of a plurality oftriangular shaped adhesive patches distributed across the upper surfaceof the bibulous layer 34. Obviously, other patterns may be used as well.This may include a very light flood coating of adhesive applied to theupper surface of the bibulous layer. While this very light layer couldbe considered to cover the entire upper surface, the lightness of thelayer and the irregular upper surface of the bibulous layer actuallycause the adhesive to remain porous such that absorbency is maintained.Alternatively, or in addition to the adhesive, the upper surface of thebibulous layer may be treated so as to have a static charge to furtherenhance its ability to collect dirt and debris.

As a further possibility, the threads or fiber which make up the wovenor non-woven fabric of the bibulous layer may themselves be naturallysticky, or treated or partially coated with a tackifier such that theyhave some tackiness and grab and retain dirt and debris. As will beclear to those of skill in the art, the pattern coated adhesive mayoperate to interconnect the various cleaning sheets of the mat 30 suchthat adhesive on the underside of the moisture barrier layer 32 iseliminated. This is illustrated in FIG. 4. If the bibulous layerconsists of fibers which are treated with a tackifier, this adhesive ortackifier by itself may be sufficient to interconnect the bibulous layerwith the adjacent moisture barrier layer and/or to retain the cleaningsheets in their stacked configuration.

As a further alternative, with all embodiments of the present invention,the bibulous layers may be impregnated with a solution such as cleaningsolution or a germicide. A germicide may also be incorporated in apattern coated adhesive. Other cleaning materials may also be patterncoated onto the upper surface of the bibulous layers. These variouscleaning solutions may act to sterilize or further clean shoes, paws, orwheels. The solution may be applied to the bibulous layer by floodingit, dipping it, or pattern coating it. One example of a cleaningsolution is a dusting oil. Also, the bibulous layer may be treated witha perfume or perfume oil.

As mentioned previously, the second embodiment of the cleaning mat 30also differs from the first embodiment in that the perimeter portion 36is larger than on the first embodiment. Obviously, these features may be“mixed and matched” among the various embodiments as best suits theapplication. The larger perimeter portion 36 is illustrated to show howthe perimeter can help avoid transport of liquid from one layer toanother. Also, in some embodiments of the present invention, theperimeter portions 36 may be adhesively attached to one another so as toseal in the lower bibulous layers. In this way, even complete saturationof the upper bibulous layer or the surrounding floor does not causewetting of the lower bibulous layers. Also, if some or all of thebibulous layers are coated or impregnated with a cleaning solution,interconnecting the perimeters seals in the solution to avoid prematureevaporation.

Turning now to FIGS. 5 and 6, a third embodiment of a cleaning mat isgenerally shown at 40. This embodiment differs from the previousembodiments in that the edges 42 of each of the bibulous layers 44 aretreated so as to avoid moisture transport out of the edges 42. That is,the edges 42 are treated or impregnated with a substance such as avarnish so as to eliminate the absorbency and moisture transportcapability of the edges. In this way, the center portion of the bibulouslayer 44 may become saturated and the edges 42 act as sides to retainthis liquid in the center. As will be clear to those of skill in theart, this may be accomplished in other ways as well. For example, in anon-woven bibulous layer, the edges may be melted so as to seal thefibers to one another. Other waterproof coatings may also be applied tothe edges. This approach may also provide increased strength to theedges preventing fraying or premature wear of the edges.

Turning now to FIGS. 7 and 8, a fourth embodiment of a cleaning mataccording to the present invention is generally shown at 50. For someapplications, it is desirable to provide a version of the cleaning matthat is able to retain more dirt and debris. The embodiment 50 of FIGS.7 and 8 differs from the previous embodiments in that a plurality ofperforations 52 are provided through the bibulous layer 54. Though shownonly in a few places in FIG. 7, the perforations preferably are providedin all areas of the bibulous layer 54. Alternatively, the edges may notbe perforated. As best shown in FIG. 8, the perforations 52 passentirely through the bibulous layer 54 to the adhesive 56interconnecting the moisture barrier layer 58 with the bibulous layer54. Therefore, each of the perforations acts like a little dish or cupwith adhesive in the bottom of the cup. Therefore, when someone wipestheir feet on the cleaning mat 50, the perforations not only help tocatch dirt and debris by providing a rougher upper surface, but alsoprovide “traps” for the dirt and debris. Dirt and debris which fallsinto the perforations 52 is retained therein by the adhesive 56 in thebottom of the perforations. The upper surface of the bibulous layer 54may be pattern coated with adhesive, as previously discussed. Together,this makes a highly effective cleaning mat. Obviously, the perforations52 may be left less deep so that they do not pass all the way to theadhesive 56. This retains the benefit of providing recesses wherein dirtand debris may be captured and providing a rougher upper surface, butdoes not adhesively retain the dirt and debris in the perforations 52.Alternatively, these less deep perforations could be adhesively coatedas part of the pattern coating process so that the perforations do notneed to pass entirely through the bibulous layer 54. In the embodimentof the present invention wherein the bibulous layer and the moisturebarrier layer are heat bonded together, no adhesive exists at the loweredge of the bibulous layer. In this situation, the perforations lackadhesive bottoms, or adhesive may be added. As a further alternative,the bibulous layer may have two sublayers. The upper sublayer consistsof a net or gauze that is relatively open and coated with a tackifier oradhesive. A lower sublayer is solid and absorbent. This provides asimilar effect to pattern coating because the upper sublayer isrelatively open so that moisture can still reach the lower absorbentlayer. It also provides a somewhat rougher upper surface and areas totrap dirt and debris.

Turning now to FIG. 9, a top view of a mat 60, which may be used withany embodiment of the present invention, is shown having a pair of linesbisecting the mat 60 both top to bottom and side to side. Obviously, forsome applications, the various mats of the present invention may belarge in size. For merchandising purposes, it is preferable that the matbe packageable in a package smaller than the dimensions of the mat. Forthis purpose, it is desirable to fold the mat. This may be accomplishedin several ways. The backing sheet and/or the cleaning sheets may beserrated or completely cut along one of the two lines 62 and 64 shown inFIG. 9. This gives a “relief” along which folding may occur. Also, inthe vicinity of the folding area, the pattern coating adhesive may beleft off to avoid gluing of the two sides of the fold to one another.Also, a release layer may be provided prior to folding so that the tackysurfaces do not come into contact. In use, the mat 60 would be unfoldedand the release layer removed. Where the sheets or the backing sheet arerigid, a score line is particularly preferable because it allowsfolding.

Referring now to FIG. 10, a fifth embodiment of the present invention isgenerally shown at 70. This cleaning mat 70 is similar to the previousembodiments except that instead of adhesive holding the plurality ofcleaning sheets in a stacked configuration, four corner tabs 72 areprovided at the corners of the backing sheet. Then, the corners of thecleaning sheets may be tucked under these tabs so that they are retainedin their stacked configuration. This also provides ease of refill. Thisoperates similar to some desktop calendars which have a cardboardbacking sheet and corner pockets into which calendar sheets are tuckedfor use. As an alternative, the pockets or tabs may extend completelyalong two or more edges of the backing sheet.

FIG. 11 shows yet another approach to maintaining the cleaning sheets ina stacked configuration without the need for adhesive between theindividual sheets. In this embodiment of the cleaning mat 80, staples 82are used to interconnect the cleaning sheets in their stackedconfiguration. When an uppermost cleaning sheet becomes soiled, it istorn from the staples to expose the next lower sheet. Pieces ofcardboard or other stiff material may be used at the corners tostrengthen the staple connections. The approaches of FIGS. 10 and 11 maybe altered in a variety of ways without departing from the scope of theinvention. For example, the corner tabs or pockets may be combined withthe staples. In this case, a staple in each corner may be covered by acorner pocket so as to hide the staple. The sheets would first bestapled together and then the corner pocket placed over each corner tohide the staples. The pocket could be held in place in a variety of waysincluding hot melt glue. Alternatively, the corner pockets may be placedover the corners and then a staple placed through the pockets and thesheets. A label or cover may be placed over the top of the staple tohide it. Also, a double adhesive strip may cover the bottom of thestaple to cover it, protect the floor, and hold the mat in place. Thesesame approaches may be applied where edge strips are used in place ofcorner pockets. As yet another alternative, perforations, as shown at 84in FIG. 11, may be placed at the corners adjacent the staples to easeremoval of soiled sheets. Corner pockets may then cover the staples andthe perforations. Also, some adhesive may be placed between the sheetson the embodiments of FIGS. 10 and 11 to assist the staples and/orpockets in stabilizing the stack. As a further alternative with anyembodiment of the present invention, the base sheet may define a “frame”for the removable sheets. For example, it may have sloped edges and arecessed center portion wherein the individual sheets may rest.

As discussed with the various embodiments, a backing sheet or base sheetis preferably provided which contacts the floor. It is preferred thatthe cleaning mat stay in one place during use. For this purpose, thebase sheet may be provided with adhesive on its underside so as toretain it in contact and in position on the floor. Alternatively, thebackside of the base sheet may be coated with an anti-slip substancesuch as rubber. The base sheet may be any of a variety of materials suchas a heavier cardboard or plastic. Also, the base sheet may merely be anidentical or differently sized cleaning sheet as the remaining sheets inthe stack. Adhesive on the backside of the base sheet may be protectedby a release layer which is removed prior to placing the mat on thefloor. Adhesive strips may also be applied to the bottom sheet in one ormore spots. A release layer may cover these spots and be removed whenthe mat is put into place.

The bibulous layers may be modified in various ways depending on theapplication of the cleaning mat. For example, a scrim or mesh may beincluded in the construction of the bibulous layer to add strength tothe bibulous layer. The scrim can be incorporated so as to slightlypucker the upper surface of the bibulous layer to improve the wipingability of the upper surface. Also, the present invention hasapplications other than as a cleaning mat. For example, the mat may bemodified so as to be a pet mat whereon a pet such as a dog or cat mayrest or sleep. It may also serve as a puppy-training pad. For thispurpose, the mat may have a very low tack adhesive to retain pet hairdeposited by the pet. Also, the bibulous layer may be treated with anattractant to make the mat attractive to the pet. Further, solutionssuch as cleaning solutions or anti-flea preparations may be added to thepet mat as needed.

Turning now to FIGS. 13–16, a sixth embodiment of a cleaning mat systemaccording to the present invention will be described. In thisembodiment, the base is reusable and receives a removable and disposablecleaning sheet. The base and the cleaning sheet may both take more thanone form, according to the present invention.

FIGS. 13 and 14 show perspective views of the base 100 of the cleaningmat system according to this embodiment. The base 100 may come inseveral sizes, as is typical for floor mats. For example, for home use,the base may have dimensions of approximately 20 inches by 30 inches.Larger or smaller mats may be used for other applications. For example,in commercial settings, a much larger base may be desirable. As is knownto those of skill in the art, a base 100 with dimensions sufficientlylarge to function as a typical floor mat, may be difficult to ship andstore due to dimensional constraints. For example, retail outlets oftenrestrict shelf space available to a single product to a size less than atypical floor mat. According to the present invention, the mat 100preferably is provided in multiple sections, so that the base 100 can beshipped and stored more compactly. In FIG. 13, the base 100 is shown ashaving three pieces, a middle section 102, and a pair of end sections104 and 106. The three sections 102–106 may be interconnected in any ofa variety of ways. For example, they may interlock like puzzle pieces,may use interlocking tabs, or may glue or Velcro together. Any otherapproach to interconnecting the sections may be used with the presentinvention. FIG. 14 shows the three sections 102–106 interconnected toform a single base 100. Alternatively, the base 100 may be provided as asingle piece, in two sections, or in four or more sections. As shown,each of the sections 102–106 preferably has a tapered edge 108 so thatthe assembled base 100 has a tapered edge 108 around its entireperimeter. The mat 100 may be said to have a perimeter edge 110 whichdefines the perimeter of the base 100 and is tapered on all sides so asto reduce catching on objects and to make it easier for wheeled objectsto roll over the base 100. The perimeter edge 110 may be said to includea leading edge 112 and an opposed trailing edge 114.

Other alternatives are also available for allowing the base of thecleaning mat system to be shipped, stored, and displayed for retailsale. As one preferred alternative, the base may be provided as a singlepiece, formed of a material which may be rolled either side-to-side orend-to-end so as to require less dimensional shelf space. FIGS. 20 and21 show another preferred alternative. In this embodiment, the base 116is shown as viewed from the leading edge 118. The base 116 is one piece,but has a slit 120 defined in the upper surface 122 of the base 116,running from the leading edge 118 to the trailing edge. This allows thebase 116 to be folded at the slit 120. Another slit 124 is provided inthe lower surface 126, for folding. The slits 120 and 124 divide thebase into approximate thirds. FIG. 21 shows the base 116 folded at theslits. This reduces the dimensional space requirements for the base 116in a manner similar to the three-piece base of FIGS. 13 and 14, butreduces assembly requirements for the user. As will be clear to those ofskill in the art, additional slits may be provided, or the slits may beprovided in differing arrangements to suit particular foldingrequirements. As a further alternative, the base may be provided inmultiple sections, with additional sections interconnected so as toincrease the size of the base.

The base for use with the present invention may be formed of a varietyof materials, such as plastics or rubber. It is preferred that the basebe substantial enough and heavy enough to generally maintain itsposition in an entryway or other position of use. Some flexibility andresiliency is also preferred, such that the base will conform to asurface that is not completely level or flat.

Referring now to FIGS. 15 and 16, the base 100 is shown with a cleaningsheet 130 disposed thereon. It should be understood that any version ofthe base may be used. Most embodiments of the base 100 preferablyinclude gripping members defined in the lower surface 132. Thesegripping members are shown as recesses in FIG. 15, and generallyindicated as 134 and 136. These gripping members 134 and 136 may takeseveral forms, and are designed to grip the edges of the cleaning sheet130. One preferred embodiment is shown in FIG. 18A, which shows theunderside 132 of the base 100. A preferred embodiment of the grippingmembers is shown at 134, 136, 138, and 140. These gripping members134–140 are designed to have an edge of a cleaning sheet tucked therein,or may have a slit in a cleaning sheet positioned over a tab that formspart of each of the gripping members 134–140. Further discussion of thistype of gripping member, is provided in applicant's pending U.S. patentapplication Ser. No. 09/602,189, filed Jun. 12, 2000 U.S. Pat. No.6,405,403, and co-pending U.S. patent application Ser. No. 09/993,137,filed Nov. 16, 2001 U.S. Pat. No. 6,810,554, the entire contents ofwhich are incorporated herein by reference.

These incorporated disclosures are directed to cleaning tools, includingmops and mitts. Any of the technology disclosed in these disclosures maybe used with the present cleaning mat system according to the presentinvention. For example, these disclosures provide information aboutvarious embodiments of cleaning sheets, moisture barrier layers,treatments, assembly techniques, and methods of interconnecting cleaningsheets with tools. Any of these aspects may be applied to the presentinvention.

As shown in FIG. 18, the gripping members 134–140 are preferablyprovided as four gripping members, with two being provided adjacent theleading edge 112 and two adjacent the trailing edge 114. They arepreferably outboard close to the corners so as to grip the cleaningsheet near its corners. Additional gripping members may be provided, orfewer. Also, other configurations of gripping members may be used.Referring again to FIGS. 13 and 14, it may be seen that openings, suchas 142 are visible from the upper side of the base 100. These openingsare part of the formation of one embodiment of the gripping members andcould allow the cleaning sheets to be tucked in from the top side or thebottom side.

The cleaning sheet 130 in FIG. 15 may take multiple forms, including anydiscussed in this specification, as well as in the incorporatedspecifications. For example, the cleaning sheet may be textured, asdiscussed earlier. In the illustrated embodiment, the cleaning sheet 130is a two layer cleaning sheet, with a fabric upper layer 144 thatgenerally covers the upper surface 146 of the base 100, and astrengthening/reinforcement layer 148 which extends beyond the sides ofthe upper fabric layer 144, wraps around the leading and trailing edges,and interconnects with the gripping members 134 and 136, as well asgripping members not shown. The cleaning sheet 130 may be said to have apair of spaced apart side edges 150 and 152, with these side edges 150and 152 engaging the gripping members.

The upper fabric layer 144 may be a woven or non-woven material suitablefor cleaning objects which contact the cleaning mat system. Whilereferred to as a fabric, this term is used herein to indicate anymaterial, including paper-based, fiber-based, man made and syntheticmaterials, which are suitable for cleaning, and is not limited to clothor cloth-like materials. In some embodiments, the fabric layer 144 isbibulous, in that it absorbs water. However, it may also be hydrophobic,or not particularly absorbent. As another alternative, additionalmaterials may be added to the fabric layer, to enhance its absorptivecharacteristics. For example, a moisture absorbing material may be addedto the fabric layer or disposed between the fabric layer and thestrengthening layer 148. The fabric layer may also be treated with acleaning solution, an antibiotic solution, or other materials asdiscussed herein and in the incorporated specifications. The surface maybe treated with a tackifier, a disinfectant, an anti-microbial, afragrance, a cleaner, or other substances, and/or be water activated. Ifa tackifier is used, all or a portion of the surface may be treated, orpattern coating may be used so as to provide tackiness while retainingabsorptive capabilities.

The strengthening layer 148 supports and reinforces the fabric layer 144and may be a plastic material, or other materials discussed in thepresent specification, as well as in the incorporated specifications.The strengthening layer 148 may serve as a moisture barrier layer. As analternative to the illustrated embodiment, the fabric layer 144 andstrengthening layer 148 may be co-extensive, such that both the layersengage the gripping members. Alternatively, the fabric layer may extendover more or less of the strengthening layer 148 than in the illustratedembodiment.

The base 100 preferably has an upper surface 146 that is not recessedwith respect to the perimeter edges, though the upper surface can besomewhat recessed with respect to the edges for particular applications.Also, while the upper surface 146 is shown as flat or smooth in some ofthe figures, the upper surface may be textured so as to function as atraditional mat when the cleaning sheet is not in place. Also, sometexturing may enhance retention and stability of the cleaning sheet.

Referring now to FIGS. 18A–18C, installation of the cleaning sheet willbe discussed. FIG. 18A shows the base 100 without a cleaning sheetinstalled, with the lower surface 132 shown. In 18B, a cleaning sheet130 has been positioned adjacent the upper surface of the base 100 withthe side edges 150 and 152 partially wrapped about the base 100. Theillustrated version of the cleaning sheet 130 is shown having four slits154 near the side edges 150 and 152 and positioned in alignment with thegripping members 134–140. One of the slits is shown engaging grippingmember 140. FIG. 18C shows the cleaning sheet 130 completely engagedwith the base 100. For purposes of the present invention, the slitsengaging the gripping members falls within the definition of the sideedges engaging the gripping members. In other words, “side edges”include the slits and the portions of the cleaning sheet near theabsolute edges.

Referring now to FIGS. 17A–17D, alternative embodiments of cleaningsheets will be discussed. In the embodiment of FIG. 15, the cleaningsheet 130 was a single sheet. Once the sheet becomes soiled, the userdetaches the side edges from the gripping members and replaces thecleaning sheet with a replacement cleaning sheet. As anotheralternative, the cleaning sheet 130 may have an additional fabric layeron the underside of the strengthening layer 148 so that the cleaningsheet may be “flipped over” and reused. However, in either case, thecleaning sheet 130 is removed in its entirety once it is soiled. In theembodiment of FIGS. 17A and 17B, a plurality of individually removableand disposable cleaning sheets is provided in a stacked configuration160. The stacked configuration 160 consists of a plurality of individualcleaning sheets 162, with each cleaning sheet 162 preferably constructedsimilar to the cleaning sheet 130 of FIG. 15. That is, each cleaningsheet 162 has an upper fabric layer 164 and a lower reinforcement layer166. In the embodiment of FIGS. 17A and 17B, the fabric layer 164 isprovided only on the central portion of the stacked configuration 160,with the reinforcement layer 166 extending beyond the fabric layer so asto define a perimeter adjacent the spaced apart side edges 168 and 170.Preferably, the perimeters or margins of the reinforcement layers 166are joined together, as best shown in FIG. 17B. This seals in theunexposed fabric layers to prevent them from becoming soiled.

As shown in FIG. 17A, perforations 172 are preferably providedintermediate the side edges 168 and 170 and the edges of the fabriclayer 164. The perforations 172 allow an outermost soiled cleaning sheetto be removed from the stacked configuration and disposed. As analternative to perforations, the cleaning sheets may be scored orweakened so as to define a separable area. Gripping tabs 174 and/or 176may be provided at one or both sides so as to allow a soiled sheet to begripped and removed. The stacked configuration 160 may have slits 178provided adjacent the edges 168 and 170 so that the stackedconfiguration may be interconnected with the base, as was shown in FIGS.18B and 18C. Alternatively, the side edges may be tucked into othertypes of gripping members. In one preferred embodiment, five to tencleaning sheets form the stacked configuration. Referring again to FIGS.13 and 14, a protrusion 180 may be provided on the leading and trailingside edges of the base so as to be aligned with the tabs 174 and 176 onthe stacked configuration 160 of cleaning sheets. This protrusion liftsthe tabs upwardly somewhat so they may be more easily gripped. FIG. 16shows a protrusion with a tab on top of it.

Referring now to FIG. 15, the base 100 may have feet 182 provided on thelower surface 132. The feet 182 are provided in some embodiments, andpreferably are compressed such that the feet 182 are compressed and thelower surface 132 of the base 100 is pressed against the floor or thesupport surface when a sufficiently heavy object is placed on top of thecleaning mat system. This causes the portions of the cleaning sheet 130that wrap around the leading edge 112 and the trailing edge 114 to beheld against the floor, so as to be stabilized. However, when the weightis removed from the base 100, the feet 182 preferably lift the baseslightly upwardly so that the cleaning sheet 130 may more easily beremoved.

In the embodiment of the present invention wherein a stackedconfiguration of cleaning sheets is used, the perforations 172 arepreferably positioned underneath the leading and trailing edges 112 and114 so that the perforations are somewhat weighted during use. However,in the embodiments that provide the feet 182, the base lifts upwardsomewhat when the weight is removed. The tab 174 and/or 176 may begripped so as to tear the outermost cleaning sheet away at theperforations 172, which now are not weighted by the base 100.Preferably, the user grabs both tabs 174 and 176 and pulls them away sothat the cleaning sheet folds upwardly and traps any dirt on thecleaning sheet. The feet 182 are shown as individual little pads, suchas shown on the lower surface 132 in FIG. 18A. However, the feet may becontinuous strips, or tubes that run side-to-side or front-to-back. Theymay be formed of foam, rubber, or plastic, or other materials suitableto the application. It is also preferred that the feet help to preventslipping of the base 100. For this purpose, the feet, or lower surfaceof the base 100 may be tacky or otherwise grip the support surface onwhich the cleaning mat system in placed. Suction cups may also beprovided on the lower surface or on the feet. As yet anotherpossibility, one-half of a section of hook and loop fastener materialmay be attached to the support surface, with the complementary halfattached to the underside of the base 100, so that the base may beinterconnected with the floor, and removed as necessary.

Referring now to FIG. 17C, an alternative embodiment of a stackedconfiguration of cleaning sheets 190 is shown. The stacked configuration190 includes a plurality of cleaning sheets 192 and a backing sheet 194.As shown, the backing sheet 194 preferably extends beyond the edges ofthe stack of cleaning sheets 192. The backing sheet 194 is then theportion of the stack configuration that engages the gripping members onthe base. In this version, the individual cleaning sheets 192 may besingle layers of fabric, or may each have double layers, such as afabric layer and a reinforcement layer. In this version, the individualcleaning sheets are preferably retained in the stacked configuration byadhesive, but may be retained in the stacked configuration in other waysdiscussed in the present specification or in the incorporatedspecifications. The single sheet embodiment of FIG. 15 may also consistof a single fabric layer, without a second strengthening layer. Also, asingle fabric layer, or multiple fabric layers, may have a reinforcementinternal thereto, such as a scrim.

Referring now to FIG. 17D, another alternative embodiment of a stackedconfiguration 196 is shown. This configuration consists of a pluralityof cleaning sheets 198, with each cleaning sheet being coextensive tothe side edges and the portion near the edges being compressed to formin the margin areas 200. For example, if non-woven material is used asthe cleaning layers, the non-woven material may be compressed and heatedso as to form a substantially thinner edge area which may be gripped bythe gripping members. The individual cleaning sheets may consist of asingle fabric layer, a reinforced fabric layer, a fabric layer plus areinforcement layer, or a fabric layer that is coated so as to preventmoisture transport from one layer to the next cleaning sheet. Otherembodiments where a single-layer fabric cleaning sheet is used may alsohave a coating so as to prevent the transport of moisture from one sheetto another.

Referring now to FIG. 19, an alternative embodiment of a base 210 willbe described. In this embodiment, the base 210 has a first slot 212defined through the base from the upper surface 214 to the lower surface216 adjacent the leading edge 218. A second slot 220 is defined from theupper surface 214 to the lower surface 216 adjacent the trailing edge222. The slot preferably extends most of the width of the base. Acleaning sheet 224 is then disposed on the base 210 with its side edges226 and 228 passing through the slots 212 and 220, respectively, andengaging gripping members 230 and 232, respectively. Feet 234 and 236may be optionally provided inboard of the gripping members 230 and 232.In the embodiment of FIG. 19, the cleaning sheet 224 does not have towrap around the leading edge 218 and trailing edge 222. This somewhatreduces the required size of the cleaning sheet 224. Also, it canprovide a neater and more durable appearance, since the cleaning sheetis not exposed at the leading and trailing edges. As an alternative, theslots 212 and 220 may serve as the gripping members, with the edges ofthe cleaning sheet tucked into the slots and the slots then gripping theedges of the cleaning sheet. The embodiment of FIG. 19 may also be usedwith any of the embodiments wherein multiple cleaning sheets areprovided in a stacked configuration. As a further alternative, the basemay be constructed like some sandpaper holders, wherein the edges areseparable with the edge of the sandpaper pushed into the separatededges, and then the edges are released so as to grip the sandpaper. Insome embodiments, gripping teeth are provided in the separable edges.

Referring now to FIGS. 22 and 23, yet another embodiment of a cleaningmat system according to the present invention will be discussed. In thisembodiment, a base 250 is provided, which has a similar cross-sectionalshape to the previously discussed bases. However, the base 250preferably does not have gripping members or feet. Instead, it istapered to a leading edge 252 and trailing edge 254. In this embodiment,a cleaning sheet is provided as a cleaning sleeve 256. The sleeve 256wraps completely around the base 250 so that the base 250 issubstantially contained within the sleeve. Put another way, the sleeve256 may be said to have an opening therein, with the base 250 receivedin the opening. The sleeve 256 may be a loop with two open ends, or maybe closed at one end. The embodiment with two open ends is shown in FIG.23. Here, the base 250 is shown with the sleeve 256 wrapped around it.The base 250 extends out of each end of the sleeve 256. Any embodimentof cleaning sheet discussed herein may be used with this base, with thecleaning sheet, or stacked configuration of cleaning sheets beingmodified such that it forms a loop or sleeve. In the illustratedembodiment, the sleeve 256 has a fabric upper lay 258 that covers justthe upper surface of the base 250, and a reinforcement layer 260 thatextends around and wraps around the leading and trailing edges 252 and254, and covers the lower surface of the base 250. Alternatively, thefabric layer 258 and reinforcement layer 260 may be coextensive, or thecleaning sleeve may be a single fabric layer. In these embodiments, thesleeve can be partially rotated about the base as portions become soiledso as to expose new unsoiled portions. Embodiments may also be providedwith multiple removable cleaning sheets, with a base sheet or a portionof all sheets forming the portion that wraps around the base. In someembodiments, the base 250 is reshaped to enhance its function with thisembodiment. As shown in FIG. 23, the base 250 is slightly widened at itstwo ends so that the sleeve 256 does not easily slide off of the base250. The widened portions of the base may be flexible so as to be flexedout of the way when the sleeve is placed thereon. Alternatively, theentire base may be folded into a U-shape with the sleeve slipped over,and then the base released so as to completely fill the sleeve. It maybe a slightly loose or somewhat tight fit, but it is preferred thatthere is little or no relative movement between the sleeve and the baseso as to prevent slipping.

As discussed above, the base that forms part of the present inventionmay be constructed in a wide variety of ways. It is preferred that thebase be foldable or rollable to reduce shipping and storage size, and itis preferred for some embodiments that the base have feet to lift itupwardly to allow release of the cleaning sheets when a person is notstanding on the mat. FIGS. 24–27 illustrate further variations on thedesign of the underside of the base. These design alterations may beused with any of the previous embodiments and may be combined with anyof the previous features.

FIG. 24 shows the underside of a mat base 300. In this embodiment, thebase 300 has a plurality of downwardly extending fingers or nubs 302which define the majority of the lower surface of the base 300. As withprevious embodiments, the base 300 preferably has gripping members forgripping the cleaning sheet. The base 300 may have a perimeter 304 thatmay be flat on the underside and sloped on the upper side to ease thetransition to the upper surface. An advantage to the use of the fingers302 is that the mat may be folded or rolled either side-to-side orend-to-end. In this case, the fingers merely spread apart as the base isflexed. The perimeter 304 may have slits 306 at various places along thesides and/or the ends to allow the thicker perimeter 304 to be folded aswell. As another alternative, slits may be provided all along each ofthe sides and/or ends so that the perimeter may be folded in anyposition, or rolled. That is, the slits will extend upwardly from thelower surface of the perimeter to near the top so that they flex byfolding the upper surface onto itself. In embodiments where feet aredesired, some of the fingers 302 may be made longer as shown in FIG. 25.The longer fingers are shown at 308. As with prior embodiments, it ispreferred that the feet 308 compress when a person stands on the mat. Asshown, the fingers 302 and 308 are preferably slightly tapered for moldrelease purposes. In one embodiment the mat has an overall thickness ofthe ½ inch or less, with the fingers having a height of approximately ⅜of an inch or less. With all embodiments, the grippers, such as 310, maybe integrally molded with the remainder of the mat, or may be aseparable piece that is added to the mat and attached thereto, such asby gluing or heat melt.

Referring now to FIG. 26, an alternative configuration of the undersideof a mat 320 is shown. In this case, the underside has a waffle or boxpattern of ribs that extend downwardly from the upper surface. Theseribs 322 have a lower end that defines much of the lower surface of themat 320. As shown, the mat may have relieved areas 324 which may be cutor otherwise left so that the base 320 may be folded at these points.Feet may be provided by attaching them to the bottom, or the ribs may belonger in some areas. FIG. 27 shows yet a further alternative. In thisembodiment, the bottom surface is defined by a plurality of generallyparallel ribs or walls 330 that extend downwardly from the uppersurface. Because the walls 330 are generally parallel to each other, themat may be folded in such a way that the walls spread apart from oneanother. Alternatively, the walls may be run front-to-back so thatfolding may be done side-to-side. Feet may be added if desired, and thegrippers may be integrally formed or a separate piece. Again, any of theembodiments of the base may be made from a variety of materials,including plastics and rubber. The use of walls or fingers reduces theoverall material usage on the base, thereby saving material cost.However, as an alternative, the base may be mostly a solid piece ofmaterial with slits running side-to-side or front-to-back to allow it tobe rolled or folded.

Referring now to FIGS. 28–32, yet another embodiment of a mat base 350will be described. The base 350 has a central section 352 and a pair ofside edge portions 354 and 356 that define opposite side edges of thebase 350. The base 350 may be made out of a variety of materials, thoughit is preferred that at least the side portions 354 and 356 are formedof a non-slip material and that the base be sufficiently heavy so as toremain in place. As shown in the detailed portion of FIG. 28, thecentral portion 352 has a plurality of fingers, pins, or teeth 358extending upwardly from a central generally planar member 360. Thegenerally planar member 360 extends between and interconnects the sideportions 354 and 356. The fingers or teeth 358, in one embodiment, coverthe entire central planar member 360 and may be randomly arranged orarranged at regular intervals, as shown. In the illustrated embodiment,the central planar member 360 has portions shaped as strips that are notcovered by the teeth 358. These areas or strips allow for easier foldingof the base for shipping, storing, or for installation of the disposablecover, as will be described herein below.

In the illustrated embodiment, the folding zones or strips include apair of strips 362 and 364 that extend front-to-rear of the base 350 anda single strip 366 that runs side-to-side between the side portions 354and 356. In the illustrated embodiment, each of the strips 362–364 is aband in which teeth 358 are not provided. In addition, as best shown inFIG. 30, the central member 360 is also thinner in the areas of thestrips. FIG. 30 shows a cross-sectional view of the mat and shows strip364. This thinning of the member 360 makes the base easier to foldeither side-to-side or end-to-end. As also shown in FIG. 30, the member360 has teeth or fingers provided on both the upper and lower surfaces.Preferably, strips such as 362–366 are also provided on the lowersurface, in alignment with the strips of the upper surface, to furtherease folding. The thickness of the member 360, the height of the teeth358 and the thickness of the end portions 354 and 356 are chosen suchthat the teeth preferably do not extend through the plans defined by theupper and lower surfaces of the end portions 354 and 356.

Referring now to FIG. 31, the pins or teeth 358 will be described inmore detail. In one preferred embodiment the teeth 358 are generallycone-shaped with a generally circular base with a diameter A ofapproximately 0.062 inches. The teeth 358 taper upwardly from the baseto a narrower upper end. The teeth 358 have an overall height ofapproximately 0.125 inches, while the top has a radius of curvature ofapproximately 0.015 inches. The sides of the teeth taper atapproximately 8 degrees. The teeth 358 may be randomly scattered or maybe arranged in regular intervals. In one preferred embodiment thecenter-to-center spacing E of the teeth 358 is approximately 0.19inches. Referring again to FIG. 30, the end portions 354 and 356preferably have a thickness, for this embodiment, of approximately 0.5inches, while the majority of the member 360 has a thickness ofapproximately 0.25 inches. In embodiments where the strips 362–364 arethin, they have a top-to-bottom thickness of approximately 0.125 inchesand a side-to-side or front-to-back width of approximately 0.75 inches.The perimeter of the base is preferably angled or tapered, as best shownin FIG. 30. The angle of this taper, in one embodiment, is approximately45 degrees and has a width of approximately 0.25 inches.

As will be appreciated by those of skill in the art, the base 350 ispreferably symmetrical such that it may be flipped top-to-bottom so asto change which surface of the base is exposed. Alternatively, thebottom side may be flat such that only the top surface is used forwiping and the bottom is designed to be against the floor. In this case,the perimeter may be sloped to meet the floor, as with earlierembodiments.

Referring now to FIG. 32, a cross-sectional end view of the base 350 isshown with a disposable sleeve 370 positioned thereon. As shown, thesleeve 370 is a loop that extends across the upper and lower surfaces ofthe base and is engaged by the teeth. The sleeve 370 takes severalforms. In one preferred embodiment, such as illustrated, the sleeve 370is a single sheet of fabric or fabric-like material that extends acrossthe top and bottom of the base 350. In this embodiment, the sleeve 370does not have a backing layer, such as a plastic. The sleeve 370 may beperforated at its edges to allow removal when soiled. As an alternative,shown in the detailed blow-up of FIG. 32, the sleeve 370 may take theform of an upper sheet 372 and a lower sheet 374 that are bonded to oneanother at a junction zone 376. They may be joined together at each ofthe sides or may be a single sheet that is bonded to itself at only oneposition. To remove the soiled sleeve 370 from the base 350, the sleeveis separated at the junction region 376, such as by separating the heatbonded or adhesive bonded region. Alternatively, the fabric layer may bebacked by a reinforcement layer, such as plastic or Tyvek® with thelayers bonded together, and then two such two layer sheets can be edgebonded to form a sleeve. Or, the lower sheet can be just a reinforcementlayer designed to hold the upper sheet on the base. A tab 378 may beprovided on one or both sides of an upper sheet to aid in removal ofsoiled sheets. In one embodiment, tabs are provided adjacent each sideso that the user may grasp two tabs and pull them towards one another sothat dirt is captured into the folding upper surface.

Installation of the sleeve 370 onto the base 350 may be accomplished ina variety of ways. In one preferred approach, the base is folded ontoitself in a taco-shape. For this purpose, it is folded along strip 366.The sleeve 370 may then be slid over the base, which is now muchnarrower than in the unfolded position, and the base is released so asto fill the sleeve. Preferably, the sleeve is shipped and sold in afolded configuration. In this case, one fold will be down the center ofthe long direction, thereby “marking” the center of the sleeve.Preferably, the taco-folded base is aligned with this center line priorto being released so that the sleeve is properly positioned.Alternatively, the sleeve may have an actual marking to assist inpositioning the sleeve. The sleeve may be formed of a material thatallows it to stretch slightly so that it remains snug on the base 350.However, in one preferred embodiment, the sleeve is a non-woven materialwith a scrim reinforcement so as to limit the amount of stretching. Thesleeve 370 is then gripped by the teeth 358, which may extend partiallyor completely through all or portions of the sleeve 370. In this way,the upper ends of the teeth grip the sleeve and also may extend slightlythrough so as to provide an enhanced wiping surface for shoes or feet.In alternative embodiments, the base 350 may have springy edges alongthe elongated edges so as to stretch the sleeve 370. For example, wiresor flexible members may arc out along the edges in the plane of the baseso as to form arch-like shapes that stretch the sleeve.

Another approach to installing the sleeve 370 onto the base is toprovide the sleeve as a sheet that is wrapped about the base and twoedges are then joined, such as by adhesive. In another embodiment of thesleeve 370 the woven or non-woven fabric or fabric-like material isbacked with a reinforcement or moisture barrier layer. This layer mayhelp to strengthen the sleeve, but may also assist in sliding the sleeveover the folded base. The base 350 may also be folded in other ways,such as providing two folding zones so that it may be Z-folded tofurther reduce its width. In yet other embodiments, the sleeve 370 maybe multiple layers with the outer layer peeled off, as was discussedwith earlier embodiments of the present invention. The embodiment of theinvention shown in FIGS. 28–32 may be used with any of the previouslydiscussed versions of refills or cleaning sheets, including those withmargins that are not covered by a fabric-like material. In embodimentswhere only the top of the base is used for wiping, a sleeve may beprovided that can be rotated about the base to bring the “bottom” partof the sleeve to the top. The sleeves are preferably provided asrefills, and will may have multiple sleeves in a package. Also, thesleeves may be provided pretreated, as discussed previously for otherrefills.

Referring now to FIG. 33, an alternative embodiment of a cleaning matsystem 380 will be described. This embodiment is similar to the matsystem 350 previously described, but is designed for use with a cleaningsheet rather than a cleaning sleeve. As shown in this cross-sectionalview, the cleaning mat system 380 includes a base 382 with an upper andlower surface, and a plurality of teeth 384 extending from the uppersurface. These teeth 384 cover the majority of the upper surface of thebase 382. As with the previous embodiment, this base 382 preferably hasside portions that are not covered by teeth and assists in maintainingthe base in position on a floor. The base 382 may have a lower surfacethat is substantially identical to the upper surface, with teethcovering the majority of the surface. Alternatively, the lower surfacemay be as illustrated in FIG. 33, with teeth provided only near theleading and trailing edges 386 and 388. In the illustrated embodiment, acentral area 390 between the leaving and trailing edges 386 and 388 doesnot have teeth, but is instead slightly thinner and generally flat. Thecleaning sheet 392 has a central portion 394 that is disposed on theupper surface of the base 382 and a pair of side edge portions 396 and398 that wrap around the leading and trailing edges 386 and 388. Thecleaning sheet may take any of the forms previously discussed, but it ispreferably a non-woven material that is absorbent and breathable. Bywrapping the edge portions 396 and 398 around the leading and trailingedges 386 and 388, the side edge portions become trapped between theteeth on the lower surface and the floor when the base is in a useposition on the floor. This causes the teeth to grip these side edgeportions and help to retain the cleaning sheet 392 in position. As withthe prior embodiment, the teeth 384 preferably slightly penetrate thecentral portion 394 of the cleaning sheet 392 when pressure is appliedagainst the cleaning sheet. As shown, the base 382 preferably has holes400 defined from the upper surface to the lower surface between theteeth 382. This allows air circulation to dry the cleaning sheet 392 andthe base 382. Such perforations may also be provided in priorembodiments of the base, as well as the version of the presentembodiment wherein teeth are provided across the other underside.

The above discussed embodiments of the present invention are preferablyintended for use on floors of residences and businesses. However, thepresent invention may also have application on other surfaces. Forexample, the present invention, as is or modified, is highly suitablefor use on the floors of a vehicle, such as a car or truck. Preferably,the above embodiments are slightly modified so as to provide a floor matbase shaped to fit in the vehicle footwell, as is the case with typicalvehicle floor mats. In one version, the floor mat is configured as shownin FIG. 32. That is, the floor mat base has a plurality of upwardlyextending and/or downwardly extending teeth and a cleaning sheet orsleeve is wrapped about the base. The cleaning sheet may cover theentire floor mat, or only a portion thereof. For example, the cleaningsheet or sleeve preferably at least covers the area where a driver'sfeet typically rest. In an alternative embodiment, the base is designedas shown in FIG. 33, with teeth on the upper side and just near theedges of the underside. Holes through the mat may be provided in any ofthe embodiments. A cleaning sheet is then wrapped about at least aportion of the base and wrapped under to be engaged by the teeth on thelower edge. As yet a further embodiment, cleaning sheets according tothe present invention may be provided to be wrapped about floor matsthat are currently used in vehicles. As is known to those of skill inthe art, floor mats in vehicles often have downwardly extending teeth onthe underside to help retain them in position in the vehicle. A cleaningsheet according to the present invention may be wrapped about such afloor mat, whether carpeted or rubber, and have the edges wrapped undersuch that they are gripped by the existing teeth on the underside of themat. With any of these car specific embodiments, the cleaning sheets mayuse any of the previously discussed cleaning sheet technology. That is,the sheets may be a single fabric layer, may be an absorptive layer witha barrier layer, may include extra absorbency or fragrance oranti-microbial substances, and may include multiple tear-off sheetsusing any of the attachment systems previously discussed. A car floormat may also be provided using the design of earlier embodiments of thepresent invention wherein grippers are provided for gripping the edgesof the refill. As another alternative, cleaning sheets for use onexisting floor mats may have a coating of adhesive partially orcompletely covering the backside so that the sheet sticks to theexisting floor mat. This may be used with or without the edges wrappingaround it being engaged by the teeth on the underside of the mat. Afloor mat base may also be provided according to the present inventionthat is designed for use with or without a cleaning sheet in a vehicle.For example, the floor mat may be designed so as to have a rubber orcarpeted upper surface with or without upwardly extending teeth, and bespecifically designed to grip a refill as it wraps around the edges, orto receive a sleeve.

As will be clear to those of skill in the art, the illustrated anddiscussed embodiments of the present invention may be modified invarious ways without departing from the scope or teaching of the presentinvention. It is the following claims, including all equivalents, whichdefine the scope of the invention.

1. A cleaning mat system for placement on a floor and for cleaning the undersides of shoes, feet, and other objects, said cleaning mat system comprising: a base having an upper surface and a lower surface interconnected by a perimeter edge, said perimeter edge including a leading edge, an opposed trailing edge and a pair of side edges extending between the leading and trailing edges, said upper surface of said base including a plurality of upwardly extending teeth covering the majority of said upper surface, said lower surface of said base being configured to be disposed against the floor when the base is in a use position, the lower surface having a plurality of downwardly extending teeth covering at least a portion of said lower surface adjacent said leading edge and at least a portion of said lower surface adjacent said trailing edge; and a removable and disposable cleaning sheet having an upper face for cleaning and an opposed lower face, said cleaning sheet having a pair of spaced apart side edge portions and a central portion therebetween, said cleaning sheet comprising a fabric layer operative to clean an object which contacts said upper face; said cleaning sheet having a use position wherein said sheet is disposed on said base such that said lower face of said central portion is adjacent said upper surface of said base and said central portion of said sheet is partially penetrated by said plurality of teeth when said central portion of said sheet is pressed against said teeth, one of said side edge portions of said cleaning sheet wrapping about said leading edge of said base and being disposed against said lower surface such that said one side edge portion is disposed between said teeth adjacent said leading edge and the floor when the base is in the use position, and the other of said side edge portions wrapping about said trailing edge of said base and being disposed against said lower surface such that said other side edge portion is disposed between said teeth adjacent said trailing edge and the floor when the base is in the use position; whereby said cleaning sheet is retained on said base with said upper face directed upwardly to clean an object that contacts said cleaning mat system, and said teeth on said upper surface assist in maintaining said sheet in position and assist in wiping an object which moves against said upper face of said cleaning sheet.
 2. The cleaning mat system according to claim 1, wherein said plurality of downwardly extending teeth on said lower surface of said base cover the majority of said lower surface.
 3. The cleaning mat system according to claim 2, wherein said upper and said lower surfaces of said base are substantially identical.
 4. The cleaning mat system according to claim 1, wherein said base comprises a side portion adjacent each of said side edges and a midportion extending between said side portions, said upwardly extending and said downwardly extending teeth being disposed on said midportion and not on said side portions.
 5. The cleaning mat system according to claim 4, wherein said cleaning sheet is sized such that said central portion of said cleaning sheet covers said upper surface of said midportion and does not cover said side portions, said side portions having a thickness equal to or greater than a thickness of said midportion such that said side portions contact the floor and assist in preventing movement of said base on the floor when the base is in the use position.
 6. The cleaning mat system according to claim 5, wherein said side portions are formed of a rubber-like material that resists movement with respect to the floor when the base is in the use position.
 7. The cleaning mat system according to claim 1, wherein said base has a plurality of holes defined from said upper surface to said lower surface to allow air circulation from said upper surface to said lower surface of said base, said holes being defined between said teeth.
 8. The cleaning mat system according to claim 1, wherein said cleaning sheet further comprises a reinforcement layer, said fabric layer defining said upper face of said cleaning sheet and said reinforcement layer defining said lower face of said cleaning sheet.
 9. The cleaning mat system according to claim 8, wherein said fabric layer of said cleaning sheet comprises a bibulous layer and said lower reinforcement layer comprises a moisture barrier layer.
 10. The cleaning mat system according to claim 1, wherein said fabric layer further comprising a moisture absorbing material added to said fabric layer.
 11. The cleaning mat system according to claim 1, wherein said fabric layer comprises a non-woven material.
 12. The cleaning mat system according to claim 1, wherein said fabric layer is reinforced with a scrim.
 13. The cleaning mat system according to claim 1, wherein said cleaning sheet is absorbent, said upper face of said cleaning sheet having an adhesive covering only a portion of said upper face and operative to grab and retain dirt and debris that comes in contact with said upper face, a portion of said upper face remaining non-occluded such that absorbency is maintained.
 14. The cleaning mat system according to claim 1, wherein said cleaning sheet is imbibed with an anti-microbial substance.
 15. The cleaning mat system according to claim 1, wherein said cleaning sheet is imbibed with a fragrance.
 16. The cleaning mat system according to claim 1, wherein said base comprises multiple sections which may be assembled to form said base and disassembled for storage.
 17. The cleaning mat system according to claim 1, wherein said base comprises at least one slit defined in said upper or said lower surface, said at least one slit extending partially through said base and running from said leading edge to said trailing edge such that said base may be folded at said slit for storage. 